Ah right. I was going for the most generous estimate I could find which was 20% left handedness, but wikipedia tells me that (in the US, at least), it’s 12% for 20 year olds, down to around 5% at 50 year olds. For anyone too lazy to do the maths, taking Ralph’s value of 8%, the odds of 5 randomly selected people all being left handed are .0003%, or 3 in a million.